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Sum up values in a single MySQL column in a specific way?


1 Answer
Anvi Jain

Use aggregate function SUM() along with OVER. Let us first create a table −

mysql> create table DemoTable
   (
   CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   CustomerValue int
   );
Query OK, 0 rows affected (0.64 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(CustomerValue) values(10);
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable(CustomerValue) values(20);
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable(CustomerValue) values(30);
Query OK, 1 row affected (0.23 sec)

mysql> insert into DemoTable(CustomerValue) values(40);
Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+------------+---------------+
| CustomerId | CustomerValue |
+------------+---------------+
|          1 |            10 |
|          2 |            20 |
|          3 |            30 |
|          4 |            40 |
+------------+---------------+
4 rows in set (0.00 sec)

Following is the query to sum up values in a single column in a specific way −

mysql> select CustomerId,
   SUM(CustomerValue) OVER (ORDER BY CustomerId) SpecificSum from DemoTable;

This will produce the following output −

+------------+-------------+
| CustomerId | SpecificSum |
+------------+-------------+
|          1 |          10 |
|          2 |          30 |
|          3 |          60 |
|          4 |         100 |
+------------+-------------+
4 rows in set (0.00 sec)

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